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If one or both of your transceivers is other than Yaesu or K3, then the setting of the SH1/SH2 jumper
is immaterial, and can be left installed. More later in Section 6 on how to interface other
manufacturers’ radios to the OS.
Reinstall the cover using previously removed screws and lock washers. It is important to tighten the
screws so that the enclosure pieces have good contact. Do not over tighten to strip out the hole!
K3 Menu Setting
– Go to the K3’s Config Menu and set
TX INH
to
HI = Inh
.
RF, 12Vdc Power, and Amplifier Control Connections
a. RF Connections – Connect Radio A’s RF output to the A connector on the OS. Similarly,
connect Radio B to the B connector. The amplifier/antenna is connected to the “COM” connector
on the OS.
b. 12Vdc Power – Use the provided 2.5mm dc power plug to connect to your 12V source at the OS
rear panel connector. The OS does not derive power from the radio(s), so this is a mandatory
connection, regardless of radio type.
c. Amplifier Control – If an amplifier is being shared, connect the AMP connector to the
amplifier’s relay control input.
Yaesu or K3 Transceivers
a. Radio TXG interface – Connect a cable from the radio’s connector that provides a ground when
the radio goes into transmit mode. This can either be a relay contact or an N-channel transistor.
The voltage seen by the radio on this line is 12Vdc. The connector at the OS is an RCA.
b. Radio transmit inhibit (TXINH) connections:
Yaesu FT-1000/2000/5000/9000 transceivers
– The TXINH line is on the “Band Data”
connector. The connector is a DIN 8-262 connector. This is a special connector for Yaesu radios,
and is available from The RFConnection, and others. Do not attempt to plug a regular, DIN 8-
270 into the Band Data jack on the radio, as you will damage the jack.
Fig. 3 – Yaesu Radio Band Data Jack
Connect the TXINH line to pin 8 and ground (shield) to pin 3.
NOTE: Other Yaesu models, such as the FT-1200 and FT-3000 have a different style jack. Consult
your manual for TX INH connection details.
